/**
 * Return a fibonacci sequence as an array.
 *
 * parameter:  n
 * @return {number[]}
 */
export default function fibonacci( n ) {
  const fibSequence = [ 1 ];

  let currentValue = 1;
  let previousValue = 0;

  if ( n === 1 ) {
    return fibSequence;
  }

  let iterationsCounter = n - 1;

  while ( iterationsCounter ) {
    currentValue += previousValue;
    previousValue = currentValue - previousValue;

    fibSequence.push( currentValue );

    iterationsCounter -= 1;
  }

  return fibSequence;
}
